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V-269865

CAT III (Low)

The Dell OS10 multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated Router (DR) for any undesirable multicast groups and sources.

Rule ID

SV-269865r1137930_rule

STIG

Dell OS10 Switch Router Security Technical Implementation Guide

Version

V1R2

CCIs

CCI-001414

Discussion

Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast packets, over-using the available bandwidth and thereby creating a denial-of-service (DoS) condition. Hence, it is imperative that register messages are accepted only for authorized multicast groups and sources.

Check Content

Verify the RP router is configured to filter PIM register messages. 

!
ip access-list PIM_REGFILTER
seq 10 permit ip 10.10.10.2/32 any
!

!
ip pim register-filter PIM_REGFILTER
!

If the RP router peering with PIM-SM routers is not configured with a PIM import policy to block registration messages for any undesirable multicast groups and sources, this is a finding.

Fix Text

Configure the RP router to filter PIM register messages received from a multicast DR for any undesirable multicast groups or sources.

OS10# configure terminal
OS10(config)#
OS10(config)#
OS10(config)# ip access-list PIM_REGFILTER
OS10(config-ipv4-acl)# permit ip 10.10.10.2/32 any
OS10(config-ipv4-acl)# exit
OS10(config)#
OS10(config)# ip pim register-filter PIM_REGFILTER